Hi there,
I suggest you to check with the Equal Opportunities Commission. You can call their hotline on 2511 8211.
According to the EOC leaflet on the pregnancy discrimination :
Situations where pregnancy discrimination in employment are often seen to arise:
Not being hired for a job
Dismissal during pregnancy or upon return from maternity leave
Being bypassed for promotion or favourable transfer
Subjected to demotion or unfavourable transfer
Not being offered a pay rise or bonus consistent with what other employees receive
Changes to working hours, roles and duties without just causes
Positions filled by substituting or existing employees
Source :
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Good luck !